s390/boot: Make identity mapping base address explicit

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This is a preparatory rework to allow uncoupling virtual
and physical addresses spaces.

Currently the identity mapping base address is implicit
and is always set to zero. Make it explicit by putting
into __identity_base persistent boot variable and use it
in proper context - which is the value of PAGE_OFFSET.

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

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This commit is contained in:

Alexander Gordeev 2023-08-10 21:40:19 +02:00

parent 3bb11234b1

commit 7de0446f0b

2 changed files with 5 additions and 2 deletions

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6

arch/s390/include/asm/page.h

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1

arch/s390/kernel/setup.c

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